Support extra args for ansible playbooks

[tpdownes]

A common pattern in Ansible is to supply the --extra-vars argument or other arguments to ansible-playbook. See, for example, our own invocation in integration tests.

We do not presently support this in Runners. This PR adds that support. It will be useful for use cases such as rendering a Terraform value into an Ansible variable:

  role_example = {
    "type"        = "ansible-local"
    "content"     = file("${path.module}/files/example_role.yml")
    "destination" = "example_role.yml"
    "args"        = "-e \"password_id=${google_secret_manager_secret.pool_password.secret_id}\""
  }

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[tpdownes]

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